1 /* Deal with I/O statements & related stuff.
2 Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
3 Free Software Foundation, Inc.
4 Contributed by Andy Vaught
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 2, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING. If not, write to the Free
20 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
31 format_asterisk = {0, NULL, NULL, -1, ST_LABEL_FORMAT, ST_LABEL_FORMAT, NULL,
36 const char *name, *spec;
42 tag_file = { "FILE", " file = %e", BT_CHARACTER },
43 tag_status = { "STATUS", " status = %e", BT_CHARACTER},
44 tag_e_access = {"ACCESS", " access = %e", BT_CHARACTER},
45 tag_e_form = {"FORM", " form = %e", BT_CHARACTER},
46 tag_e_recl = {"RECL", " recl = %e", BT_INTEGER},
47 tag_e_blank = {"BLANK", " blank = %e", BT_CHARACTER},
48 tag_e_position = {"POSITION", " position = %e", BT_CHARACTER},
49 tag_e_action = {"ACTION", " action = %e", BT_CHARACTER},
50 tag_e_delim = {"DELIM", " delim = %e", BT_CHARACTER},
51 tag_e_pad = {"PAD", " pad = %e", BT_CHARACTER},
52 tag_unit = {"UNIT", " unit = %e", BT_INTEGER},
53 tag_advance = {"ADVANCE", " advance = %e", BT_CHARACTER},
54 tag_rec = {"REC", " rec = %e", BT_INTEGER},
55 tag_spos = {"POSITION", " pos = %e", BT_INTEGER},
56 tag_format = {"FORMAT", NULL, BT_CHARACTER},
57 tag_iomsg = {"IOMSG", " iomsg = %e", BT_CHARACTER},
58 tag_iostat = {"IOSTAT", " iostat = %v", BT_INTEGER},
59 tag_size = {"SIZE", " size = %v", BT_INTEGER},
60 tag_exist = {"EXIST", " exist = %v", BT_LOGICAL},
61 tag_opened = {"OPENED", " opened = %v", BT_LOGICAL},
62 tag_named = {"NAMED", " named = %v", BT_LOGICAL},
63 tag_name = {"NAME", " name = %v", BT_CHARACTER},
64 tag_number = {"NUMBER", " number = %v", BT_INTEGER},
65 tag_s_access = {"ACCESS", " access = %v", BT_CHARACTER},
66 tag_sequential = {"SEQUENTIAL", " sequential = %v", BT_CHARACTER},
67 tag_direct = {"DIRECT", " direct = %v", BT_CHARACTER},
68 tag_s_form = {"FORM", " form = %v", BT_CHARACTER},
69 tag_formatted = {"FORMATTED", " formatted = %v", BT_CHARACTER},
70 tag_unformatted = {"UNFORMATTED", " unformatted = %v", BT_CHARACTER},
71 tag_s_recl = {"RECL", " recl = %v", BT_INTEGER},
72 tag_nextrec = {"NEXTREC", " nextrec = %v", BT_INTEGER},
73 tag_s_blank = {"BLANK", " blank = %v", BT_CHARACTER},
74 tag_s_position = {"POSITION", " position = %v", BT_CHARACTER},
75 tag_s_action = {"ACTION", " action = %v", BT_CHARACTER},
76 tag_read = {"READ", " read = %v", BT_CHARACTER},
77 tag_write = {"WRITE", " write = %v", BT_CHARACTER},
78 tag_readwrite = {"READWRITE", " readwrite = %v", BT_CHARACTER},
79 tag_s_delim = {"DELIM", " delim = %v", BT_CHARACTER},
80 tag_s_pad = {"PAD", " pad = %v", BT_CHARACTER},
81 tag_iolength = {"IOLENGTH", " iolength = %v", BT_INTEGER},
82 tag_convert = {"CONVERT", " convert = %e", BT_CHARACTER},
83 tag_strm_out = {"POS", " pos = %v", BT_INTEGER},
84 tag_err = {"ERR", " err = %l", BT_UNKNOWN},
85 tag_end = {"END", " end = %l", BT_UNKNOWN},
86 tag_eor = {"EOR", " eor = %l", BT_UNKNOWN};
88 static gfc_dt *current_dt;
90 #define RESOLVE_TAG(x, y) if (resolve_tag(x, y) == FAILURE) return FAILURE;
93 /**************** Fortran 95 FORMAT parser *****************/
95 /* FORMAT tokens returned by format_lex(). */
98 FMT_NONE, FMT_UNKNOWN, FMT_SIGNED_INT, FMT_ZERO, FMT_POSINT, FMT_PERIOD,
99 FMT_COMMA, FMT_COLON, FMT_SLASH, FMT_DOLLAR, FMT_POS, FMT_LPAREN,
100 FMT_RPAREN, FMT_X, FMT_SIGN, FMT_BLANK, FMT_CHAR, FMT_P, FMT_IBOZ, FMT_F,
101 FMT_E, FMT_EXT, FMT_G, FMT_L, FMT_A, FMT_D, FMT_H, FMT_END
105 /* Local variables for checking format strings. The saved_token is
106 used to back up by a single format token during the parsing
108 static char *format_string;
109 static int format_length, use_last_char;
111 static format_token saved_token;
114 { MODE_STRING, MODE_FORMAT, MODE_COPY }
118 /* Return the next character in the format string. */
121 next_char (int in_string)
133 if (mode == MODE_STRING)
134 c = *format_string++;
137 c = gfc_next_char_literal (in_string);
142 if (gfc_option.flag_backslash && c == '\\')
145 locus old_locus = gfc_current_locus;
147 /* Use a temp variable to avoid side effects from gfc_match_special_char
148 since it uses an int * for its argument. */
151 if (gfc_match_special_char (&tmp) == MATCH_NO)
152 gfc_current_locus = old_locus;
156 if (!(gfc_option.allow_std & GFC_STD_GNU) && !inhibit_warnings)
157 gfc_warning ("Extension: backslash character at %C");
160 if (mode == MODE_COPY)
161 *format_string++ = c;
168 /* Back up one character position. Only works once. */
176 /* Eat up the spaces and return a character. */
179 next_char_not_space (void)
186 while (gfc_is_whitespace (c));
190 static int value = 0;
192 /* Simple lexical analyzer for getting the next token in a FORMAT
203 if (saved_token != FMT_NONE)
206 saved_token = FMT_NONE;
210 c = next_char_not_space ();
218 c = next_char_not_space ();
229 c = next_char_not_space ();
231 value = 10 * value + c - '0';
240 token = FMT_SIGNED_INT;
259 c = next_char_not_space ();
262 value = 10 * value + c - '0';
270 token = zflag ? FMT_ZERO : FMT_POSINT;
294 c = next_char_not_space ();
295 if (c != 'L' && c != 'R')
314 c = next_char_not_space ();
315 if (c != 'P' && c != 'S')
322 c = next_char_not_space ();
323 if (c == 'N' || c == 'Z')
384 c = next_char_not_space ();
385 if (c == 'N' || c == 'S')
428 /* Check a format statement. The format string, either from a FORMAT
429 statement or a constant in an I/O statement has already been parsed
430 by itself, and we are checking it for validity. The dual origin
431 means that the warning message is a little less than great. */
434 check_format (bool is_input)
436 const char *posint_required = _("Positive width required");
437 const char *nonneg_required = _("Nonnegative width required");
438 const char *unexpected_element = _("Unexpected element");
439 const char *unexpected_end = _("Unexpected end of format string");
448 saved_token = FMT_NONE;
456 error = _("Missing leading left parenthesis");
462 goto finished; /* Empty format is legal */
466 /* In this state, the next thing has to be a format item. */
491 /* Signed integer can only precede a P format. */
495 error = _("Expected P edit descriptor");
502 /* P requires a prior number. */
503 error = _("P descriptor requires leading scale factor");
507 /* X requires a prior number if we're being pedantic. */
508 if (gfc_notify_std (GFC_STD_GNU, "Extension: X descriptor "
509 "requires leading space count at %C")
519 goto extension_optional_comma;
528 if (gfc_notify_std (GFC_STD_GNU, "Extension: $ descriptor at %C")
531 if (t != FMT_RPAREN || level > 0)
533 gfc_warning ("$ should be the last specifier in format at %C");
534 goto optional_comma_1;
552 error = unexpected_end;
556 error = unexpected_element;
561 /* In this state, t must currently be a data descriptor.
562 Deal with things that can/must follow the descriptor. */
576 error = _("Repeat count cannot follow P descriptor");
591 switch (gfc_notification_std (GFC_STD_GNU))
594 gfc_warning ("Extension: Missing positive width after L "
600 error = posint_required;
625 error = posint_required;
632 /* Warn if -std=legacy, otherwise error. */
633 if (gfc_option.warn_std != 0)
634 gfc_error_now ("Period required in format specifier at %C");
636 gfc_warning ("Period required in format specifier at %C");
642 if (u != FMT_ZERO && u != FMT_POSINT)
644 error = nonneg_required;
651 /* Look for optional exponent. */
662 error = _("Positive exponent width required");
671 if (t != FMT_ZERO && t != FMT_POSINT)
673 error = nonneg_required;
676 else if (is_input && t == FMT_ZERO)
678 error = posint_required;
685 /* Warn if -std=legacy, otherwise error. */
686 if (gfc_option.warn_std != 0)
687 gfc_error_now ("Period required in format specifier at %C");
689 gfc_warning ("Period required in format specifier at %C");
695 if (t != FMT_ZERO && t != FMT_POSINT)
697 error = nonneg_required;
704 if (!(gfc_option.allow_std & GFC_STD_GNU) && !inhibit_warnings)
705 gfc_warning ("The H format specifier at %C is"
706 " a Fortran 95 deleted feature");
708 if(mode == MODE_STRING)
710 format_string += value;
711 format_length -= value;
725 if (t != FMT_ZERO && t != FMT_POSINT)
727 error = nonneg_required;
730 else if (is_input && t == FMT_ZERO)
732 error = posint_required;
744 if (t != FMT_ZERO && t != FMT_POSINT)
746 error = nonneg_required;
754 error = unexpected_element;
759 /* Between a descriptor and what comes next. */
778 error = unexpected_end;
782 if (gfc_notify_std (GFC_STD_GNU, "Extension: Missing comma at %C")
789 /* Optional comma is a weird between state where we've just finished
790 reading a colon, slash, dollar or P descriptor. */
805 /* Assume that we have another format item. */
812 extension_optional_comma:
813 /* As a GNU extension, permit a missing comma after a string literal. */
831 error = unexpected_end;
835 if (gfc_notify_std (GFC_STD_GNU, "Extension: Missing comma at %C")
845 gfc_error ("%s in format string at %C", error);
847 /* TODO: More elaborate measures are needed to show where a problem
848 is within a format string that has been calculated. */
856 /* Given an expression node that is a constant string, see if it looks
857 like a format string. */
860 check_format_string (gfc_expr *e, bool is_input)
863 format_string = e->value.character.string;
864 return check_format (is_input);
868 /************ Fortran 95 I/O statement matchers *************/
870 /* Match a FORMAT statement. This amounts to actually parsing the
871 format descriptors in order to correctly locate the end of the
875 gfc_match_format (void)
880 if (gfc_current_ns->proc_name
881 && gfc_current_ns->proc_name->attr.flavor == FL_MODULE)
883 gfc_error ("Format statement in module main block at %C");
887 if (gfc_statement_label == NULL)
889 gfc_error ("Missing format label at %C");
892 gfc_gobble_whitespace ();
897 start = gfc_current_locus;
899 if (check_format (false) == FAILURE)
902 if (gfc_match_eos () != MATCH_YES)
904 gfc_syntax_error (ST_FORMAT);
908 /* The label doesn't get created until after the statement is done
909 being matched, so we have to leave the string for later. */
911 gfc_current_locus = start; /* Back to the beginning */
914 new_st.op = EXEC_NOP;
917 e->expr_type = EXPR_CONSTANT;
918 e->ts.type = BT_CHARACTER;
919 e->ts.kind = gfc_default_character_kind;
921 e->value.character.string = format_string = gfc_getmem (format_length + 1);
922 e->value.character.length = format_length;
923 gfc_statement_label->format = e;
926 check_format (false); /* Guaranteed to succeed */
927 gfc_match_eos (); /* Guaranteed to succeed */
933 /* Match an expression I/O tag of some sort. */
936 match_etag (const io_tag *tag, gfc_expr **v)
941 m = gfc_match (tag->spec, &result);
947 gfc_error ("Duplicate %s specification at %C", tag->name);
948 gfc_free_expr (result);
957 /* Match a variable I/O tag of some sort. */
960 match_vtag (const io_tag *tag, gfc_expr **v)
965 m = gfc_match (tag->spec, &result);
971 gfc_error ("Duplicate %s specification at %C", tag->name);
972 gfc_free_expr (result);
976 if (result->symtree->n.sym->attr.intent == INTENT_IN)
978 gfc_error ("Variable tag cannot be INTENT(IN) at %C");
979 gfc_free_expr (result);
983 if (gfc_pure (NULL) && gfc_impure_variable (result->symtree->n.sym))
985 gfc_error ("Variable tag cannot be assigned in PURE procedure at %C");
986 gfc_free_expr (result);
995 /* Match I/O tags that cause variables to become redefined. */
998 match_out_tag(const io_tag *tag, gfc_expr **result)
1002 m = match_vtag(tag, result);
1004 gfc_check_do_variable((*result)->symtree);
1010 /* Match a label I/O tag. */
1013 match_ltag (const io_tag *tag, gfc_st_label ** label)
1019 m = gfc_match (tag->spec, label);
1020 if (m == MATCH_YES && old != 0)
1022 gfc_error ("Duplicate %s label specification at %C", tag->name);
1027 && gfc_reference_st_label (*label, ST_LABEL_TARGET) == FAILURE)
1034 /* Do expression resolution and type-checking on an expression tag. */
1037 resolve_tag (const io_tag *tag, gfc_expr *e)
1042 if (gfc_resolve_expr (e) == FAILURE)
1045 if (e->ts.type != tag->type && tag != &tag_format)
1047 gfc_error ("%s tag at %L must be of type %s", tag->name,
1048 &e->where, gfc_basic_typename (tag->type));
1052 if (tag == &tag_format)
1054 if (e->expr_type == EXPR_CONSTANT
1055 && (e->ts.type != BT_CHARACTER
1056 || e->ts.kind != gfc_default_character_kind))
1058 gfc_error ("Constant expression in FORMAT tag at %L must be "
1059 "of type default CHARACTER", &e->where);
1063 /* If e's rank is zero and e is not an element of an array, it should be
1064 of integer or character type. The integer variable should be
1066 if (e->symtree == NULL || e->symtree->n.sym->as == NULL
1067 || e->symtree->n.sym->as->rank == 0)
1069 if (e->ts.type != BT_CHARACTER && e->ts.type != BT_INTEGER)
1071 gfc_error ("%s tag at %L must be of type %s or %s", tag->name,
1072 &e->where, gfc_basic_typename (BT_CHARACTER),
1073 gfc_basic_typename (BT_INTEGER));
1076 else if (e->ts.type == BT_INTEGER && e->expr_type == EXPR_VARIABLE)
1078 if (gfc_notify_std (GFC_STD_F95_DEL, "Deleted feature: ASSIGNED "
1079 "variable in FORMAT tag at %L", &e->where)
1082 if (e->symtree->n.sym->attr.assign != 1)
1084 gfc_error ("Variable '%s' at %L has not been assigned a "
1085 "format label", e->symtree->n.sym->name,
1090 else if (e->ts.type == BT_INTEGER)
1092 gfc_error ("scalar '%s' FORMAT tag at %L is not an ASSIGNED "
1093 "variable", gfc_basic_typename (e->ts.type),
1102 /* if rank is nonzero, we allow the type to be character under
1103 GFC_STD_GNU and other type under GFC_STD_LEGACY. It may be
1104 assigned an Hollerith constant. */
1105 if (e->ts.type == BT_CHARACTER)
1107 if (gfc_notify_std (GFC_STD_GNU, "Extension: Character array "
1108 "in FORMAT tag at %L", &e->where)
1114 if (gfc_notify_std (GFC_STD_LEGACY, "Extension: Non-character "
1115 "in FORMAT tag at %L", &e->where)
1126 gfc_error ("%s tag at %L must be scalar", tag->name, &e->where);
1130 if (tag == &tag_iomsg)
1132 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: IOMSG tag at %L",
1133 &e->where) == FAILURE)
1137 if (tag == &tag_iostat && e->ts.kind != gfc_default_integer_kind)
1139 if (gfc_notify_std (GFC_STD_GNU, "Fortran 95 requires default "
1140 "INTEGER in IOSTAT tag at %L", &e->where)
1145 if (tag == &tag_size && e->ts.kind != gfc_default_integer_kind)
1147 if (gfc_notify_std (GFC_STD_F2003, "Fortran 95 requires default "
1148 "INTEGER in SIZE tag at %L", &e->where)
1153 if (tag == &tag_convert)
1155 if (gfc_notify_std (GFC_STD_GNU, "Extension: CONVERT tag at %L",
1156 &e->where) == FAILURE)
1160 if (tag == &tag_iolength && e->ts.kind != gfc_default_integer_kind)
1162 if (gfc_notify_std (GFC_STD_F2003, "Fortran 95 requires default "
1163 "INTEGER in IOLENGTH tag at %L", &e->where)
1173 /* Match a single tag of an OPEN statement. */
1176 match_open_element (gfc_open *open)
1180 m = match_etag (&tag_unit, &open->unit);
1183 m = match_out_tag (&tag_iomsg, &open->iomsg);
1186 m = match_out_tag (&tag_iostat, &open->iostat);
1189 m = match_etag (&tag_file, &open->file);
1192 m = match_etag (&tag_status, &open->status);
1195 m = match_etag (&tag_e_access, &open->access);
1198 m = match_etag (&tag_e_form, &open->form);
1201 m = match_etag (&tag_e_recl, &open->recl);
1204 m = match_etag (&tag_e_blank, &open->blank);
1207 m = match_etag (&tag_e_position, &open->position);
1210 m = match_etag (&tag_e_action, &open->action);
1213 m = match_etag (&tag_e_delim, &open->delim);
1216 m = match_etag (&tag_e_pad, &open->pad);
1219 m = match_ltag (&tag_err, &open->err);
1222 m = match_etag (&tag_convert, &open->convert);
1230 /* Free the gfc_open structure and all the expressions it contains. */
1233 gfc_free_open (gfc_open *open)
1238 gfc_free_expr (open->unit);
1239 gfc_free_expr (open->iomsg);
1240 gfc_free_expr (open->iostat);
1241 gfc_free_expr (open->file);
1242 gfc_free_expr (open->status);
1243 gfc_free_expr (open->access);
1244 gfc_free_expr (open->form);
1245 gfc_free_expr (open->recl);
1246 gfc_free_expr (open->blank);
1247 gfc_free_expr (open->position);
1248 gfc_free_expr (open->action);
1249 gfc_free_expr (open->delim);
1250 gfc_free_expr (open->pad);
1251 gfc_free_expr (open->convert);
1256 /* Resolve everything in a gfc_open structure. */
1259 gfc_resolve_open (gfc_open *open)
1262 RESOLVE_TAG (&tag_unit, open->unit);
1263 RESOLVE_TAG (&tag_iomsg, open->iomsg);
1264 RESOLVE_TAG (&tag_iostat, open->iostat);
1265 RESOLVE_TAG (&tag_file, open->file);
1266 RESOLVE_TAG (&tag_status, open->status);
1267 RESOLVE_TAG (&tag_e_access, open->access);
1268 RESOLVE_TAG (&tag_e_form, open->form);
1269 RESOLVE_TAG (&tag_e_recl, open->recl);
1270 RESOLVE_TAG (&tag_e_blank, open->blank);
1271 RESOLVE_TAG (&tag_e_position, open->position);
1272 RESOLVE_TAG (&tag_e_action, open->action);
1273 RESOLVE_TAG (&tag_e_delim, open->delim);
1274 RESOLVE_TAG (&tag_e_pad, open->pad);
1275 RESOLVE_TAG (&tag_convert, open->convert);
1277 if (gfc_reference_st_label (open->err, ST_LABEL_TARGET) == FAILURE)
1284 /* Check if a given value for a SPECIFIER is either in the list of values
1285 allowed in F95 or F2003, issuing an error message and returning a zero
1286 value if it is not allowed. */
1289 compare_to_allowed_values (const char *specifier, const char *allowed[],
1290 const char *allowed_f2003[],
1291 const char *allowed_gnu[], char *value,
1292 const char *statement, bool warn)
1297 len = strlen (value);
1300 for (len--; len > 0; len--)
1301 if (value[len] != ' ')
1306 for (i = 0; allowed[i]; i++)
1307 if (len == strlen (allowed[i])
1308 && strncasecmp (value, allowed[i], strlen (allowed[i])) == 0)
1311 for (i = 0; allowed_f2003 && allowed_f2003[i]; i++)
1312 if (len == strlen (allowed_f2003[i])
1313 && strncasecmp (value, allowed_f2003[i], strlen (allowed_f2003[i]))
1316 notification n = gfc_notification_std (GFC_STD_F2003);
1318 if (n == WARNING || (warn && n == ERROR))
1320 gfc_warning ("Fortran 2003: %s specifier in %s statement at %C "
1321 "has value '%s'", specifier, statement,
1328 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: %s specifier in "
1329 "%s statement at %C has value '%s'", specifier,
1330 statement, allowed_f2003[i]);
1338 for (i = 0; allowed_gnu && allowed_gnu[i]; i++)
1339 if (len == strlen (allowed_gnu[i])
1340 && strncasecmp (value, allowed_gnu[i], strlen (allowed_gnu[i])) == 0)
1342 notification n = gfc_notification_std (GFC_STD_GNU);
1344 if (n == WARNING || (warn && n == ERROR))
1346 gfc_warning ("Extension: %s specifier in %s statement at %C "
1347 "has value '%s'", specifier, statement,
1354 gfc_notify_std (GFC_STD_GNU, "Extension: %s specifier in "
1355 "%s statement at %C has value '%s'", specifier,
1356 statement, allowed_gnu[i]);
1366 gfc_warning ("%s specifier in %s statement at %C has invalid value '%s'",
1367 specifier, statement, value);
1372 gfc_error ("%s specifier in %s statement at %C has invalid value '%s'",
1373 specifier, statement, value);
1379 /* Match an OPEN statement. */
1382 gfc_match_open (void)
1388 m = gfc_match_char ('(');
1392 open = gfc_getmem (sizeof (gfc_open));
1394 m = match_open_element (open);
1396 if (m == MATCH_ERROR)
1400 m = gfc_match_expr (&open->unit);
1403 if (m == MATCH_ERROR)
1409 if (gfc_match_char (')') == MATCH_YES)
1411 if (gfc_match_char (',') != MATCH_YES)
1414 m = match_open_element (open);
1415 if (m == MATCH_ERROR)
1421 if (gfc_match_eos () == MATCH_NO)
1424 if (gfc_pure (NULL))
1426 gfc_error ("OPEN statement not allowed in PURE procedure at %C");
1430 warn = (open->err || open->iostat) ? true : false;
1431 /* Checks on the ACCESS specifier. */
1432 if (open->access && open->access->expr_type == EXPR_CONSTANT)
1434 static const char *access_f95[] = { "SEQUENTIAL", "DIRECT", NULL };
1435 static const char *access_f2003[] = { "STREAM", NULL };
1436 static const char *access_gnu[] = { "APPEND", NULL };
1438 if (!compare_to_allowed_values ("ACCESS", access_f95, access_f2003,
1440 open->access->value.character.string,
1445 /* Checks on the ACTION specifier. */
1446 if (open->action && open->action->expr_type == EXPR_CONSTANT)
1448 static const char *action[] = { "READ", "WRITE", "READWRITE", NULL };
1450 if (!compare_to_allowed_values ("ACTION", action, NULL, NULL,
1451 open->action->value.character.string,
1456 /* Checks on the ASYNCHRONOUS specifier. */
1457 /* TODO: code is ready, just needs uncommenting when async I/O support
1459 if (open->asynchronous && open->asynchronous->expr_type == EXPR_CONSTANT)
1461 static const char * asynchronous[] = { "YES", "NO", NULL };
1463 if (!compare_to_allowed_values
1464 ("action", asynchronous, NULL, NULL,
1465 open->asynchronous->value.character.string, "OPEN", warn))
1469 /* Checks on the BLANK specifier. */
1470 if (open->blank && open->blank->expr_type == EXPR_CONSTANT)
1472 static const char *blank[] = { "ZERO", "NULL", NULL };
1474 if (!compare_to_allowed_values ("BLANK", blank, NULL, NULL,
1475 open->blank->value.character.string,
1480 /* Checks on the DECIMAL specifier. */
1481 /* TODO: uncomment this code when DECIMAL support is added
1482 if (open->decimal && open->decimal->expr_type == EXPR_CONSTANT)
1484 static const char * decimal[] = { "COMMA", "POINT", NULL };
1486 if (!compare_to_allowed_values ("DECIMAL", decimal, NULL, NULL,
1487 open->decimal->value.character.string,
1492 /* Checks on the DELIM specifier. */
1493 if (open->delim && open->delim->expr_type == EXPR_CONSTANT)
1495 static const char *delim[] = { "APOSTROPHE", "QUOTE", "NONE", NULL };
1497 if (!compare_to_allowed_values ("DELIM", delim, NULL, NULL,
1498 open->delim->value.character.string,
1503 /* Checks on the ENCODING specifier. */
1504 /* TODO: uncomment this code when ENCODING support is added
1505 if (open->encoding && open->encoding->expr_type == EXPR_CONSTANT)
1507 static const char * encoding[] = { "UTF-8", "DEFAULT", NULL };
1509 if (!compare_to_allowed_values ("ENCODING", encoding, NULL, NULL,
1510 open->encoding->value.character.string,
1515 /* Checks on the FORM specifier. */
1516 if (open->form && open->form->expr_type == EXPR_CONSTANT)
1518 static const char *form[] = { "FORMATTED", "UNFORMATTED", NULL };
1520 if (!compare_to_allowed_values ("FORM", form, NULL, NULL,
1521 open->form->value.character.string,
1526 /* Checks on the PAD specifier. */
1527 if (open->pad && open->pad->expr_type == EXPR_CONSTANT)
1529 static const char *pad[] = { "YES", "NO", NULL };
1531 if (!compare_to_allowed_values ("PAD", pad, NULL, NULL,
1532 open->pad->value.character.string,
1537 /* Checks on the POSITION specifier. */
1538 if (open->position && open->position->expr_type == EXPR_CONSTANT)
1540 static const char *position[] = { "ASIS", "REWIND", "APPEND", NULL };
1542 if (!compare_to_allowed_values ("POSITION", position, NULL, NULL,
1543 open->position->value.character.string,
1548 /* Checks on the ROUND specifier. */
1549 /* TODO: uncomment this code when ROUND support is added
1550 if (open->round && open->round->expr_type == EXPR_CONSTANT)
1552 static const char * round[] = { "UP", "DOWN", "ZERO", "NEAREST",
1553 "COMPATIBLE", "PROCESSOR_DEFINED", NULL };
1555 if (!compare_to_allowed_values ("ROUND", round, NULL, NULL,
1556 open->round->value.character.string,
1561 /* Checks on the SIGN specifier. */
1562 /* TODO: uncomment this code when SIGN support is added
1563 if (open->sign && open->sign->expr_type == EXPR_CONSTANT)
1565 static const char * sign[] = { "PLUS", "SUPPRESS", "PROCESSOR_DEFINED",
1568 if (!compare_to_allowed_values ("SIGN", sign, NULL, NULL,
1569 open->sign->value.character.string,
1574 #define warn_or_error(...) \
1577 gfc_warning (__VA_ARGS__); \
1580 gfc_error (__VA_ARGS__); \
1585 /* Checks on the RECL specifier. */
1586 if (open->recl && open->recl->expr_type == EXPR_CONSTANT
1587 && open->recl->ts.type == BT_INTEGER
1588 && mpz_sgn (open->recl->value.integer) != 1)
1590 warn_or_error ("RECL in OPEN statement at %C must be positive");
1593 /* Checks on the STATUS specifier. */
1594 if (open->status && open->status->expr_type == EXPR_CONSTANT)
1596 static const char *status[] = { "OLD", "NEW", "SCRATCH",
1597 "REPLACE", "UNKNOWN", NULL };
1599 if (!compare_to_allowed_values ("STATUS", status, NULL, NULL,
1600 open->status->value.character.string,
1604 /* F2003, 9.4.5: If the STATUS= specifier has the value NEW or REPLACE,
1605 the FILE= specifier shall appear. */
1606 if (open->file == NULL
1607 && (strncasecmp (open->status->value.character.string, "replace", 7)
1609 || strncasecmp (open->status->value.character.string, "new", 3)
1612 warn_or_error ("The STATUS specified in OPEN statement at %C is "
1613 "'%s' and no FILE specifier is present",
1614 open->status->value.character.string);
1617 /* F2003, 9.4.5: If the STATUS= specifier has the value SCRATCH,
1618 the FILE= specifier shall not appear. */
1619 if (strncasecmp (open->status->value.character.string, "scratch", 7)
1622 warn_or_error ("The STATUS specified in OPEN statement at %C "
1623 "cannot have the value SCRATCH if a FILE specifier "
1628 /* Things that are not allowed for unformatted I/O. */
1629 if (open->form && open->form->expr_type == EXPR_CONSTANT
1631 /* TODO uncomment this code when F2003 support is finished */
1632 /* || open->decimal || open->encoding || open->round
1634 || open->pad || open->blank)
1635 && strncasecmp (open->form->value.character.string,
1636 "unformatted", 11) == 0)
1638 const char *spec = (open->delim ? "DELIM "
1639 : (open->pad ? "PAD " : open->blank
1642 warn_or_error ("%s specifier at %C not allowed in OPEN statement for "
1643 "unformatted I/O", spec);
1646 if (open->recl && open->access && open->access->expr_type == EXPR_CONSTANT
1647 && strncasecmp (open->access->value.character.string, "stream", 6) == 0)
1649 warn_or_error ("RECL specifier not allowed in OPEN statement at %C for "
1654 && open->access && open->access->expr_type == EXPR_CONSTANT
1655 && !(strncasecmp (open->access->value.character.string,
1656 "sequential", 10) == 0
1657 || strncasecmp (open->access->value.character.string,
1659 || strncasecmp (open->access->value.character.string,
1662 warn_or_error ("POSITION specifier in OPEN statement at %C only allowed "
1663 "for stream or sequential ACCESS");
1666 #undef warn_or_error
1668 new_st.op = EXEC_OPEN;
1669 new_st.ext.open = open;
1673 gfc_syntax_error (ST_OPEN);
1676 gfc_free_open (open);
1681 /* Free a gfc_close structure an all its expressions. */
1684 gfc_free_close (gfc_close *close)
1689 gfc_free_expr (close->unit);
1690 gfc_free_expr (close->iomsg);
1691 gfc_free_expr (close->iostat);
1692 gfc_free_expr (close->status);
1697 /* Match elements of a CLOSE statement. */
1700 match_close_element (gfc_close *close)
1704 m = match_etag (&tag_unit, &close->unit);
1707 m = match_etag (&tag_status, &close->status);
1710 m = match_out_tag (&tag_iomsg, &close->iomsg);
1713 m = match_out_tag (&tag_iostat, &close->iostat);
1716 m = match_ltag (&tag_err, &close->err);
1724 /* Match a CLOSE statement. */
1727 gfc_match_close (void)
1733 m = gfc_match_char ('(');
1737 close = gfc_getmem (sizeof (gfc_close));
1739 m = match_close_element (close);
1741 if (m == MATCH_ERROR)
1745 m = gfc_match_expr (&close->unit);
1748 if (m == MATCH_ERROR)
1754 if (gfc_match_char (')') == MATCH_YES)
1756 if (gfc_match_char (',') != MATCH_YES)
1759 m = match_close_element (close);
1760 if (m == MATCH_ERROR)
1766 if (gfc_match_eos () == MATCH_NO)
1769 if (gfc_pure (NULL))
1771 gfc_error ("CLOSE statement not allowed in PURE procedure at %C");
1775 warn = (close->iostat || close->err) ? true : false;
1777 /* Checks on the STATUS specifier. */
1778 if (close->status && close->status->expr_type == EXPR_CONSTANT)
1780 static const char *status[] = { "KEEP", "DELETE", NULL };
1782 if (!compare_to_allowed_values ("STATUS", status, NULL, NULL,
1783 close->status->value.character.string,
1788 new_st.op = EXEC_CLOSE;
1789 new_st.ext.close = close;
1793 gfc_syntax_error (ST_CLOSE);
1796 gfc_free_close (close);
1801 /* Resolve everything in a gfc_close structure. */
1804 gfc_resolve_close (gfc_close *close)
1806 RESOLVE_TAG (&tag_unit, close->unit);
1807 RESOLVE_TAG (&tag_iomsg, close->iomsg);
1808 RESOLVE_TAG (&tag_iostat, close->iostat);
1809 RESOLVE_TAG (&tag_status, close->status);
1811 if (gfc_reference_st_label (close->err, ST_LABEL_TARGET) == FAILURE)
1818 /* Free a gfc_filepos structure. */
1821 gfc_free_filepos (gfc_filepos *fp)
1823 gfc_free_expr (fp->unit);
1824 gfc_free_expr (fp->iomsg);
1825 gfc_free_expr (fp->iostat);
1830 /* Match elements of a REWIND, BACKSPACE, ENDFILE, or FLUSH statement. */
1833 match_file_element (gfc_filepos *fp)
1837 m = match_etag (&tag_unit, &fp->unit);
1840 m = match_out_tag (&tag_iomsg, &fp->iomsg);
1843 m = match_out_tag (&tag_iostat, &fp->iostat);
1846 m = match_ltag (&tag_err, &fp->err);
1854 /* Match the second half of the file-positioning statements, REWIND,
1855 BACKSPACE, ENDFILE, or the FLUSH statement. */
1858 match_filepos (gfc_statement st, gfc_exec_op op)
1863 fp = gfc_getmem (sizeof (gfc_filepos));
1865 if (gfc_match_char ('(') == MATCH_NO)
1867 m = gfc_match_expr (&fp->unit);
1868 if (m == MATCH_ERROR)
1876 m = match_file_element (fp);
1877 if (m == MATCH_ERROR)
1881 m = gfc_match_expr (&fp->unit);
1882 if (m == MATCH_ERROR)
1890 if (gfc_match_char (')') == MATCH_YES)
1892 if (gfc_match_char (',') != MATCH_YES)
1895 m = match_file_element (fp);
1896 if (m == MATCH_ERROR)
1903 if (gfc_match_eos () != MATCH_YES)
1906 if (gfc_pure (NULL))
1908 gfc_error ("%s statement not allowed in PURE procedure at %C",
1909 gfc_ascii_statement (st));
1915 new_st.ext.filepos = fp;
1919 gfc_syntax_error (st);
1922 gfc_free_filepos (fp);
1928 gfc_resolve_filepos (gfc_filepos *fp)
1930 RESOLVE_TAG (&tag_unit, fp->unit);
1931 RESOLVE_TAG (&tag_iostat, fp->iostat);
1932 RESOLVE_TAG (&tag_iomsg, fp->iomsg);
1933 if (gfc_reference_st_label (fp->err, ST_LABEL_TARGET) == FAILURE)
1940 /* Match the file positioning statements: ENDFILE, BACKSPACE, REWIND,
1941 and the FLUSH statement. */
1944 gfc_match_endfile (void)
1946 return match_filepos (ST_END_FILE, EXEC_ENDFILE);
1950 gfc_match_backspace (void)
1952 return match_filepos (ST_BACKSPACE, EXEC_BACKSPACE);
1956 gfc_match_rewind (void)
1958 return match_filepos (ST_REWIND, EXEC_REWIND);
1962 gfc_match_flush (void)
1964 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: FLUSH statement at %C")
1968 return match_filepos (ST_FLUSH, EXEC_FLUSH);
1971 /******************** Data Transfer Statements *********************/
1974 { M_READ, M_WRITE, M_PRINT, M_INQUIRE }
1978 /* Return a default unit number. */
1981 default_unit (io_kind k)
1990 return gfc_int_expr (unit);
1994 /* Match a unit specification for a data transfer statement. */
1997 match_dt_unit (io_kind k, gfc_dt *dt)
2001 if (gfc_match_char ('*') == MATCH_YES)
2003 if (dt->io_unit != NULL)
2006 dt->io_unit = default_unit (k);
2010 if (gfc_match_expr (&e) == MATCH_YES)
2012 if (dt->io_unit != NULL)
2025 gfc_error ("Duplicate UNIT specification at %C");
2030 /* Match a format specification. */
2033 match_dt_format (gfc_dt *dt)
2037 gfc_st_label *label;
2039 where = gfc_current_locus;
2041 if (gfc_match_char ('*') == MATCH_YES)
2043 if (dt->format_expr != NULL || dt->format_label != NULL)
2046 dt->format_label = &format_asterisk;
2050 if (gfc_match_st_label (&label) == MATCH_YES)
2052 if (dt->format_expr != NULL || dt->format_label != NULL)
2054 gfc_free_st_label (label);
2058 if (gfc_reference_st_label (label, ST_LABEL_FORMAT) == FAILURE)
2061 dt->format_label = label;
2065 if (gfc_match_expr (&e) == MATCH_YES)
2067 if (dt->format_expr != NULL || dt->format_label != NULL)
2072 dt->format_expr = e;
2076 gfc_current_locus = where; /* The only case where we have to restore */
2081 gfc_error ("Duplicate format specification at %C");
2086 /* Traverse a namelist that is part of a READ statement to make sure
2087 that none of the variables in the namelist are INTENT(IN). Returns
2088 nonzero if we find such a variable. */
2091 check_namelist (gfc_symbol *sym)
2095 for (p = sym->namelist; p; p = p->next)
2096 if (p->sym->attr.intent == INTENT_IN)
2098 gfc_error ("Symbol '%s' in namelist '%s' is INTENT(IN) at %C",
2099 p->sym->name, sym->name);
2107 /* Match a single data transfer element. */
2110 match_dt_element (io_kind k, gfc_dt *dt)
2112 char name[GFC_MAX_SYMBOL_LEN + 1];
2116 if (gfc_match (" unit =") == MATCH_YES)
2118 m = match_dt_unit (k, dt);
2123 if (gfc_match (" fmt =") == MATCH_YES)
2125 m = match_dt_format (dt);
2130 if (gfc_match (" nml = %n", name) == MATCH_YES)
2132 if (dt->namelist != NULL)
2134 gfc_error ("Duplicate NML specification at %C");
2138 if (gfc_find_symbol (name, NULL, 1, &sym))
2141 if (sym == NULL || sym->attr.flavor != FL_NAMELIST)
2143 gfc_error ("Symbol '%s' at %C must be a NAMELIST group name",
2144 sym != NULL ? sym->name : name);
2149 if (k == M_READ && check_namelist (sym))
2155 m = match_etag (&tag_rec, &dt->rec);
2158 m = match_etag (&tag_spos, &dt->rec);
2161 m = match_out_tag (&tag_iomsg, &dt->iomsg);
2164 m = match_out_tag (&tag_iostat, &dt->iostat);
2167 m = match_ltag (&tag_err, &dt->err);
2169 dt->err_where = gfc_current_locus;
2172 m = match_etag (&tag_advance, &dt->advance);
2175 m = match_out_tag (&tag_size, &dt->size);
2179 m = match_ltag (&tag_end, &dt->end);
2184 gfc_error ("END tag at %C not allowed in output statement");
2187 dt->end_where = gfc_current_locus;
2192 m = match_ltag (&tag_eor, &dt->eor);
2194 dt->eor_where = gfc_current_locus;
2202 /* Free a data transfer structure and everything below it. */
2205 gfc_free_dt (gfc_dt *dt)
2210 gfc_free_expr (dt->io_unit);
2211 gfc_free_expr (dt->format_expr);
2212 gfc_free_expr (dt->rec);
2213 gfc_free_expr (dt->advance);
2214 gfc_free_expr (dt->iomsg);
2215 gfc_free_expr (dt->iostat);
2216 gfc_free_expr (dt->size);
2221 /* Resolve everything in a gfc_dt structure. */
2224 gfc_resolve_dt (gfc_dt *dt)
2228 RESOLVE_TAG (&tag_format, dt->format_expr);
2229 RESOLVE_TAG (&tag_rec, dt->rec);
2230 RESOLVE_TAG (&tag_spos, dt->rec);
2231 RESOLVE_TAG (&tag_advance, dt->advance);
2232 RESOLVE_TAG (&tag_iomsg, dt->iomsg);
2233 RESOLVE_TAG (&tag_iostat, dt->iostat);
2234 RESOLVE_TAG (&tag_size, dt->size);
2237 if (gfc_resolve_expr (e) == SUCCESS
2238 && (e->ts.type != BT_INTEGER
2239 && (e->ts.type != BT_CHARACTER || e->expr_type != EXPR_VARIABLE)))
2241 gfc_error ("UNIT specification at %L must be an INTEGER expression "
2242 "or a CHARACTER variable", &e->where);
2246 if (e->ts.type == BT_CHARACTER)
2248 if (gfc_has_vector_index (e))
2250 gfc_error ("Internal unit with vector subscript at %L", &e->where);
2255 if (e->rank && e->ts.type != BT_CHARACTER)
2257 gfc_error ("External IO UNIT cannot be an array at %L", &e->where);
2263 if (gfc_reference_st_label (dt->err, ST_LABEL_TARGET) == FAILURE)
2265 if (dt->err->defined == ST_LABEL_UNKNOWN)
2267 gfc_error ("ERR tag label %d at %L not defined",
2268 dt->err->value, &dt->err_where);
2275 if (gfc_reference_st_label (dt->end, ST_LABEL_TARGET) == FAILURE)
2277 if (dt->end->defined == ST_LABEL_UNKNOWN)
2279 gfc_error ("END tag label %d at %L not defined",
2280 dt->end->value, &dt->end_where);
2287 if (gfc_reference_st_label (dt->eor, ST_LABEL_TARGET) == FAILURE)
2289 if (dt->eor->defined == ST_LABEL_UNKNOWN)
2291 gfc_error ("EOR tag label %d at %L not defined",
2292 dt->eor->value, &dt->eor_where);
2297 /* Check the format label actually exists. */
2298 if (dt->format_label && dt->format_label != &format_asterisk
2299 && dt->format_label->defined == ST_LABEL_UNKNOWN)
2301 gfc_error ("FORMAT label %d at %L not defined", dt->format_label->value,
2302 &dt->format_label->where);
2309 /* Given an io_kind, return its name. */
2312 io_kind_name (io_kind k)
2331 gfc_internal_error ("io_kind_name(): bad I/O-kind");
2338 /* Match an IO iteration statement of the form:
2340 ( [<IO element> ,] <IO element>, I = <expr>, <expr> [, <expr> ] )
2342 which is equivalent to a single IO element. This function is
2343 mutually recursive with match_io_element(). */
2345 static match match_io_element (io_kind, gfc_code **);
2348 match_io_iterator (io_kind k, gfc_code **result)
2350 gfc_code *head, *tail, *new;
2358 old_loc = gfc_current_locus;
2360 if (gfc_match_char ('(') != MATCH_YES)
2363 m = match_io_element (k, &head);
2366 if (m != MATCH_YES || gfc_match_char (',') != MATCH_YES)
2372 /* Can't be anything but an IO iterator. Build a list. */
2373 iter = gfc_get_iterator ();
2377 m = gfc_match_iterator (iter, 0);
2378 if (m == MATCH_ERROR)
2382 gfc_check_do_variable (iter->var->symtree);
2386 m = match_io_element (k, &new);
2387 if (m == MATCH_ERROR)
2396 tail = gfc_append_code (tail, new);
2398 if (gfc_match_char (',') != MATCH_YES)
2407 if (gfc_match_char (')') != MATCH_YES)
2410 new = gfc_get_code ();
2412 new->ext.iterator = iter;
2414 new->block = gfc_get_code ();
2415 new->block->op = EXEC_DO;
2416 new->block->next = head;
2422 gfc_error ("Syntax error in I/O iterator at %C");
2426 gfc_free_iterator (iter, 1);
2427 gfc_free_statements (head);
2428 gfc_current_locus = old_loc;
2433 /* Match a single element of an IO list, which is either a single
2434 expression or an IO Iterator. */
2437 match_io_element (io_kind k, gfc_code **cpp)
2445 m = match_io_iterator (k, cpp);
2451 m = gfc_match_variable (&expr, 0);
2453 gfc_error ("Expected variable in READ statement at %C");
2457 m = gfc_match_expr (&expr);
2459 gfc_error ("Expected expression in %s statement at %C",
2467 if (expr->symtree->n.sym->attr.intent == INTENT_IN)
2469 gfc_error ("Variable '%s' in input list at %C cannot be "
2470 "INTENT(IN)", expr->symtree->n.sym->name);
2475 && gfc_impure_variable (expr->symtree->n.sym)
2476 && current_dt->io_unit->ts.type == BT_CHARACTER)
2478 gfc_error ("Cannot read to variable '%s' in PURE procedure at %C",
2479 expr->symtree->n.sym->name);
2483 if (gfc_check_do_variable (expr->symtree))
2489 if (current_dt->io_unit->ts.type == BT_CHARACTER
2491 && current_dt->io_unit->expr_type == EXPR_VARIABLE
2492 && gfc_impure_variable (current_dt->io_unit->symtree->n.sym))
2494 gfc_error ("Cannot write to internal file unit '%s' at %C "
2495 "inside a PURE procedure",
2496 current_dt->io_unit->symtree->n.sym->name);
2508 gfc_free_expr (expr);
2512 cp = gfc_get_code ();
2513 cp->op = EXEC_TRANSFER;
2521 /* Match an I/O list, building gfc_code structures as we go. */
2524 match_io_list (io_kind k, gfc_code **head_p)
2526 gfc_code *head, *tail, *new;
2529 *head_p = head = tail = NULL;
2530 if (gfc_match_eos () == MATCH_YES)
2535 m = match_io_element (k, &new);
2536 if (m == MATCH_ERROR)
2541 tail = gfc_append_code (tail, new);
2545 if (gfc_match_eos () == MATCH_YES)
2547 if (gfc_match_char (',') != MATCH_YES)
2555 gfc_error ("Syntax error in %s statement at %C", io_kind_name (k));
2558 gfc_free_statements (head);
2563 /* Attach the data transfer end node. */
2566 terminate_io (gfc_code *io_code)
2570 if (io_code == NULL)
2571 io_code = new_st.block;
2573 c = gfc_get_code ();
2574 c->op = EXEC_DT_END;
2576 /* Point to structure that is already there */
2577 c->ext.dt = new_st.ext.dt;
2578 gfc_append_code (io_code, c);
2582 /* Check the constraints for a data transfer statement. The majority of the
2583 constraints appearing in 9.4 of the standard appear here. Some are handled
2584 in resolve_tag and others in gfc_resolve_dt. */
2587 check_io_constraints (io_kind k, gfc_dt *dt, gfc_code *io_code,
2590 #define io_constraint(condition,msg,arg)\
2593 gfc_error(msg,arg);\
2599 gfc_symbol *sym = NULL;
2604 if (expr && expr->expr_type == EXPR_VARIABLE
2605 && expr->ts.type == BT_CHARACTER)
2607 sym = expr->symtree->n.sym;
2609 io_constraint (k == M_WRITE && sym->attr.intent == INTENT_IN,
2610 "Internal file at %L must not be INTENT(IN)",
2613 io_constraint (gfc_has_vector_index (dt->io_unit),
2614 "Internal file incompatible with vector subscript at %L",
2617 io_constraint (dt->rec != NULL,
2618 "REC tag at %L is incompatible with internal file",
2621 if (dt->namelist != NULL)
2623 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Internal file "
2624 "at %L with namelist", &expr->where)
2629 io_constraint (dt->advance != NULL,
2630 "ADVANCE tag at %L is incompatible with internal file",
2631 &dt->advance->where);
2634 if (expr && expr->ts.type != BT_CHARACTER)
2637 io_constraint (gfc_pure (NULL) && (k == M_READ || k == M_WRITE),
2638 "IO UNIT in %s statement at %C must be "
2639 "an internal file in a PURE procedure",
2646 io_constraint (dt->end, "END tag not allowed with output at %L",
2649 io_constraint (dt->eor, "EOR tag not allowed with output at %L",
2652 io_constraint (k != M_READ && dt->size,
2653 "SIZE=specifier not allowed with output at %L",
2658 io_constraint (dt->size && dt->advance == NULL,
2659 "SIZE tag at %L requires an ADVANCE tag",
2662 io_constraint (dt->eor && dt->advance == NULL,
2663 "EOR tag at %L requires an ADVANCE tag",
2671 io_constraint (io_code && dt->namelist,
2672 "NAMELIST cannot be followed by IO-list at %L",
2675 io_constraint (dt->format_expr,
2676 "IO spec-list cannot contain both NAMELIST group name "
2677 "and format specification at %L.",
2678 &dt->format_expr->where);
2680 io_constraint (dt->format_label,
2681 "IO spec-list cannot contain both NAMELIST group name "
2682 "and format label at %L", spec_end);
2684 io_constraint (dt->rec,
2685 "NAMELIST IO is not allowed with a REC=specifier "
2686 "at %L.", &dt->rec->where);
2688 io_constraint (dt->advance,
2689 "NAMELIST IO is not allowed with a ADVANCE=specifier "
2690 "at %L.", &dt->advance->where);
2695 io_constraint (dt->end,
2696 "An END tag is not allowed with a "
2697 "REC=specifier at %L.", &dt->end_where);
2700 io_constraint (dt->format_label == &format_asterisk,
2701 "FMT=* is not allowed with a REC=specifier "
2702 "at %L.", spec_end);
2707 int not_yes, not_no;
2710 io_constraint (dt->format_label == &format_asterisk,
2711 "List directed format(*) is not allowed with a "
2712 "ADVANCE=specifier at %L.", &expr->where);
2714 io_constraint (dt->format_expr == NULL && dt->format_label == NULL
2715 && dt->namelist == NULL,
2716 "the ADVANCE=specifier at %L must appear with an "
2717 "explicit format expression", &expr->where);
2719 if (expr->expr_type == EXPR_CONSTANT && expr->ts.type == BT_CHARACTER)
2721 const char * advance = expr->value.character.string;
2722 not_no = strcasecmp (advance, "no") != 0;
2723 not_yes = strcasecmp (advance, "yes") != 0;
2731 io_constraint (not_no && not_yes,
2732 "ADVANCE=specifier at %L must have value = "
2733 "YES or NO.", &expr->where);
2735 io_constraint (dt->size && not_no && k == M_READ,
2736 "SIZE tag at %L requires an ADVANCE = 'NO'",
2739 io_constraint (dt->eor && not_no && k == M_READ,
2740 "EOR tag at %L requires an ADVANCE = 'NO'",
2744 expr = dt->format_expr;
2745 if (expr != NULL && expr->expr_type == EXPR_CONSTANT
2746 && check_format_string (expr, k == M_READ) == FAILURE)
2751 #undef io_constraint
2754 /* Match a READ, WRITE or PRINT statement. */
2757 match_io (io_kind k)
2759 char name[GFC_MAX_SYMBOL_LEN + 1];
2768 where = gfc_current_locus;
2770 current_dt = dt = gfc_getmem (sizeof (gfc_dt));
2771 m = gfc_match_char ('(');
2774 where = gfc_current_locus;
2777 else if (k == M_PRINT)
2779 /* Treat the non-standard case of PRINT namelist. */
2780 if ((gfc_current_form == FORM_FIXED || gfc_peek_char () == ' ')
2781 && gfc_match_name (name) == MATCH_YES)
2783 gfc_find_symbol (name, NULL, 1, &sym);
2784 if (sym && sym->attr.flavor == FL_NAMELIST)
2786 if (gfc_notify_std (GFC_STD_GNU, "PRINT namelist at "
2787 "%C is an extension") == FAILURE)
2793 dt->io_unit = default_unit (k);
2798 gfc_current_locus = where;
2802 if (gfc_current_form == FORM_FREE)
2804 c = gfc_peek_char();
2805 if (c != ' ' && c != '*' && c != '\'' && c != '"')
2812 m = match_dt_format (dt);
2813 if (m == MATCH_ERROR)
2819 dt->io_unit = default_unit (k);
2824 /* Before issuing an error for a malformed 'print (1,*)' type of
2825 error, check for a default-char-expr of the form ('(I0)'). */
2826 if (k == M_PRINT && m == MATCH_YES)
2828 /* Reset current locus to get the initial '(' in an expression. */
2829 gfc_current_locus = where;
2830 dt->format_expr = NULL;
2831 m = match_dt_format (dt);
2833 if (m == MATCH_ERROR)
2835 if (m == MATCH_NO || dt->format_expr == NULL)
2839 dt->io_unit = default_unit (k);
2844 /* Match a control list */
2845 if (match_dt_element (k, dt) == MATCH_YES)
2847 if (match_dt_unit (k, dt) != MATCH_YES)
2850 if (gfc_match_char (')') == MATCH_YES)
2852 if (gfc_match_char (',') != MATCH_YES)
2855 m = match_dt_element (k, dt);
2858 if (m == MATCH_ERROR)
2861 m = match_dt_format (dt);
2864 if (m == MATCH_ERROR)
2867 where = gfc_current_locus;
2869 m = gfc_match_name (name);
2872 gfc_find_symbol (name, NULL, 1, &sym);
2873 if (sym && sym->attr.flavor == FL_NAMELIST)
2876 if (k == M_READ && check_namelist (sym))
2885 gfc_current_locus = where;
2887 goto loop; /* No matches, try regular elements */
2890 if (gfc_match_char (')') == MATCH_YES)
2892 if (gfc_match_char (',') != MATCH_YES)
2898 m = match_dt_element (k, dt);
2901 if (m == MATCH_ERROR)
2904 if (gfc_match_char (')') == MATCH_YES)
2906 if (gfc_match_char (',') != MATCH_YES)
2912 /* Used in check_io_constraints, where no locus is available. */
2913 spec_end = gfc_current_locus;
2915 /* Optional leading comma (non-standard). */
2917 && gfc_match_char (',') == MATCH_YES
2919 && gfc_notify_std (GFC_STD_GNU, "Extension: Comma before output "
2920 "item list at %C is an extension") == FAILURE)
2924 if (gfc_match_eos () != MATCH_YES)
2926 if (comma_flag && gfc_match_char (',') != MATCH_YES)
2928 gfc_error ("Expected comma in I/O list at %C");
2933 m = match_io_list (k, &io_code);
2934 if (m == MATCH_ERROR)
2940 /* A full IO statement has been matched. Check the constraints. spec_end is
2941 supplied for cases where no locus is supplied. */
2942 m = check_io_constraints (k, dt, io_code, &spec_end);
2944 if (m == MATCH_ERROR)
2947 new_st.op = (k == M_READ) ? EXEC_READ : EXEC_WRITE;
2949 new_st.block = gfc_get_code ();
2950 new_st.block->op = new_st.op;
2951 new_st.block->next = io_code;
2953 terminate_io (io_code);
2958 gfc_error ("Syntax error in %s statement at %C", io_kind_name (k));
2968 gfc_match_read (void)
2970 return match_io (M_READ);
2974 gfc_match_write (void)
2976 return match_io (M_WRITE);
2980 gfc_match_print (void)
2984 m = match_io (M_PRINT);
2988 if (gfc_pure (NULL))
2990 gfc_error ("PRINT statement at %C not allowed within PURE procedure");
2998 /* Free a gfc_inquire structure. */
3001 gfc_free_inquire (gfc_inquire *inquire)
3004 if (inquire == NULL)
3007 gfc_free_expr (inquire->unit);
3008 gfc_free_expr (inquire->file);
3009 gfc_free_expr (inquire->iomsg);
3010 gfc_free_expr (inquire->iostat);
3011 gfc_free_expr (inquire->exist);
3012 gfc_free_expr (inquire->opened);
3013 gfc_free_expr (inquire->number);
3014 gfc_free_expr (inquire->named);
3015 gfc_free_expr (inquire->name);
3016 gfc_free_expr (inquire->access);
3017 gfc_free_expr (inquire->sequential);
3018 gfc_free_expr (inquire->direct);
3019 gfc_free_expr (inquire->form);
3020 gfc_free_expr (inquire->formatted);
3021 gfc_free_expr (inquire->unformatted);
3022 gfc_free_expr (inquire->recl);
3023 gfc_free_expr (inquire->nextrec);
3024 gfc_free_expr (inquire->blank);
3025 gfc_free_expr (inquire->position);
3026 gfc_free_expr (inquire->action);
3027 gfc_free_expr (inquire->read);
3028 gfc_free_expr (inquire->write);
3029 gfc_free_expr (inquire->readwrite);
3030 gfc_free_expr (inquire->delim);
3031 gfc_free_expr (inquire->pad);
3032 gfc_free_expr (inquire->iolength);
3033 gfc_free_expr (inquire->convert);
3034 gfc_free_expr (inquire->strm_pos);
3039 /* Match an element of an INQUIRE statement. */
3041 #define RETM if (m != MATCH_NO) return m;
3044 match_inquire_element (gfc_inquire *inquire)
3048 m = match_etag (&tag_unit, &inquire->unit);
3049 RETM m = match_etag (&tag_file, &inquire->file);
3050 RETM m = match_ltag (&tag_err, &inquire->err);
3051 RETM m = match_out_tag (&tag_iomsg, &inquire->iomsg);
3052 RETM m = match_out_tag (&tag_iostat, &inquire->iostat);
3053 RETM m = match_vtag (&tag_exist, &inquire->exist);
3054 RETM m = match_vtag (&tag_opened, &inquire->opened);
3055 RETM m = match_vtag (&tag_named, &inquire->named);
3056 RETM m = match_vtag (&tag_name, &inquire->name);
3057 RETM m = match_out_tag (&tag_number, &inquire->number);
3058 RETM m = match_vtag (&tag_s_access, &inquire->access);
3059 RETM m = match_vtag (&tag_sequential, &inquire->sequential);
3060 RETM m = match_vtag (&tag_direct, &inquire->direct);
3061 RETM m = match_vtag (&tag_s_form, &inquire->form);
3062 RETM m = match_vtag (&tag_formatted, &inquire->formatted);
3063 RETM m = match_vtag (&tag_unformatted, &inquire->unformatted);
3064 RETM m = match_out_tag (&tag_s_recl, &inquire->recl);
3065 RETM m = match_out_tag (&tag_nextrec, &inquire->nextrec);
3066 RETM m = match_vtag (&tag_s_blank, &inquire->blank);
3067 RETM m = match_vtag (&tag_s_position, &inquire->position);
3068 RETM m = match_vtag (&tag_s_action, &inquire->action);
3069 RETM m = match_vtag (&tag_read, &inquire->read);
3070 RETM m = match_vtag (&tag_write, &inquire->write);
3071 RETM m = match_vtag (&tag_readwrite, &inquire->readwrite);
3072 RETM m = match_vtag (&tag_s_delim, &inquire->delim);
3073 RETM m = match_vtag (&tag_s_pad, &inquire->pad);
3074 RETM m = match_vtag (&tag_iolength, &inquire->iolength);
3075 RETM m = match_vtag (&tag_convert, &inquire->convert);
3076 RETM m = match_out_tag (&tag_strm_out, &inquire->strm_pos);
3077 RETM return MATCH_NO;
3084 gfc_match_inquire (void)
3086 gfc_inquire *inquire;
3091 m = gfc_match_char ('(');
3095 inquire = gfc_getmem (sizeof (gfc_inquire));
3097 loc = gfc_current_locus;
3099 m = match_inquire_element (inquire);
3100 if (m == MATCH_ERROR)
3104 m = gfc_match_expr (&inquire->unit);
3105 if (m == MATCH_ERROR)
3111 /* See if we have the IOLENGTH form of the inquire statement. */
3112 if (inquire->iolength != NULL)
3114 if (gfc_match_char (')') != MATCH_YES)
3117 m = match_io_list (M_INQUIRE, &code);
3118 if (m == MATCH_ERROR)
3123 new_st.op = EXEC_IOLENGTH;
3124 new_st.expr = inquire->iolength;
3125 new_st.ext.inquire = inquire;
3127 if (gfc_pure (NULL))
3129 gfc_free_statements (code);
3130 gfc_error ("INQUIRE statement not allowed in PURE procedure at %C");
3134 new_st.block = gfc_get_code ();
3135 new_st.block->op = EXEC_IOLENGTH;
3136 terminate_io (code);
3137 new_st.block->next = code;
3141 /* At this point, we have the non-IOLENGTH inquire statement. */
3144 if (gfc_match_char (')') == MATCH_YES)
3146 if (gfc_match_char (',') != MATCH_YES)
3149 m = match_inquire_element (inquire);
3150 if (m == MATCH_ERROR)
3155 if (inquire->iolength != NULL)
3157 gfc_error ("IOLENGTH tag invalid in INQUIRE statement at %C");
3162 if (gfc_match_eos () != MATCH_YES)
3165 if (inquire->unit != NULL && inquire->file != NULL)
3167 gfc_error ("INQUIRE statement at %L cannot contain both FILE and "
3168 "UNIT specifiers", &loc);
3172 if (inquire->unit == NULL && inquire->file == NULL)
3174 gfc_error ("INQUIRE statement at %L requires either FILE or "
3175 "UNIT specifier", &loc);
3179 if (gfc_pure (NULL))
3181 gfc_error ("INQUIRE statement not allowed in PURE procedure at %C");
3185 new_st.op = EXEC_INQUIRE;
3186 new_st.ext.inquire = inquire;
3190 gfc_syntax_error (ST_INQUIRE);
3193 gfc_free_inquire (inquire);
3198 /* Resolve everything in a gfc_inquire structure. */
3201 gfc_resolve_inquire (gfc_inquire *inquire)
3203 RESOLVE_TAG (&tag_unit, inquire->unit);
3204 RESOLVE_TAG (&tag_file, inquire->file);
3205 RESOLVE_TAG (&tag_iomsg, inquire->iomsg);
3206 RESOLVE_TAG (&tag_iostat, inquire->iostat);
3207 RESOLVE_TAG (&tag_exist, inquire->exist);
3208 RESOLVE_TAG (&tag_opened, inquire->opened);
3209 RESOLVE_TAG (&tag_number, inquire->number);
3210 RESOLVE_TAG (&tag_named, inquire->named);
3211 RESOLVE_TAG (&tag_name, inquire->name);
3212 RESOLVE_TAG (&tag_s_access, inquire->access);
3213 RESOLVE_TAG (&tag_sequential, inquire->sequential);
3214 RESOLVE_TAG (&tag_direct, inquire->direct);
3215 RESOLVE_TAG (&tag_s_form, inquire->form);
3216 RESOLVE_TAG (&tag_formatted, inquire->formatted);
3217 RESOLVE_TAG (&tag_unformatted, inquire->unformatted);
3218 RESOLVE_TAG (&tag_s_recl, inquire->recl);
3219 RESOLVE_TAG (&tag_nextrec, inquire->nextrec);
3220 RESOLVE_TAG (&tag_s_blank, inquire->blank);
3221 RESOLVE_TAG (&tag_s_position, inquire->position);
3222 RESOLVE_TAG (&tag_s_action, inquire->action);
3223 RESOLVE_TAG (&tag_read, inquire->read);
3224 RESOLVE_TAG (&tag_write, inquire->write);
3225 RESOLVE_TAG (&tag_readwrite, inquire->readwrite);
3226 RESOLVE_TAG (&tag_s_delim, inquire->delim);
3227 RESOLVE_TAG (&tag_s_pad, inquire->pad);
3228 RESOLVE_TAG (&tag_iolength, inquire->iolength);
3229 RESOLVE_TAG (&tag_convert, inquire->convert);
3230 RESOLVE_TAG (&tag_strm_out, inquire->strm_pos);
3232 if (gfc_reference_st_label (inquire->err, ST_LABEL_TARGET) == FAILURE)